It determines, with the aid of the UpdatePanel control, which portions of the
page have changed. The UpdatePanel, which you will see more of later in this chapter,
defines regions in the page that get updated as a chunk. If, for example, you have a page
CHAPTER 5 ?– INTRODUCING SERVER CONTROLS IN ASP.NET AJAX 86
Table 5-2. Continued
Property Name Function
containing a number of chat rooms and you want to update only a single chat room, you
would surround that area of the page with an UpdatePanel control.
The ScriptManager control overrides the rendering of the page and instead sends
HTML down to the XMLHttpRequest object for each of the UpdatePanel controls (which we
will discuss later) on the page.
Specifying Additional Script Components Using the ScriptReference Tag
The ScriptManager control has a
child tag that can specify additional scripts to
download to the browser. This can contain one or more tags that
specify the path to the script. Upon registering a script file through this object, you will be
able to call its methods on your page.
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